12 BRITISH FOSSIL CORALS 
Parasmilia cylindrica and Parasmilia serpentina are readily distinguished by their 
external shape ; but, owing to the polymorphic character of Parasmilia centralis, it is 
by no means easy to separate it from Parasmilia Mantelli and Parasmilia Kittoni. 
Parasmilia Mantelli, Kd. and H., was determined from one specimen alone, and it is 
clearly united to Parasmilia centralis by Parasmilia Gravesana, Kd. and H., of the White 
Chalk of Chalons-sur-Marne and Beauvais (Oise). This species has been found in Eng- 
land. Having found many specimens of Parasmilia centralis with coste like those of 
P. Mantelli in some parts of the corallum, and found normal costz in others, I consider 
P. Mantelli a variety of P. Gravesana, and that this last species is a variety and good 
sub-species of P. centralis. Parasmilia Fittoni, Ed. and H., has a large columella and 
a definite structural distinction in its tertiary coste from P. centralis. 
The following is a list of the British Parasmilie : 
1. Parasmilia centralis, Mantell, sp. 
0 » variety Mantelli. 
3 »  sub-species Gravesana, Ed. and H. 
De % Fittoni, Ed. and H. 
of we cylindrica, ,, 
A. a! serpentina,  ,, 
D. _ monilis, Duncan. 
6. hs granulata, ,, 
1. PARASMILIA CENTRALIS, A/antell, sp.; sub-species Gravesana, Ed. and H. PI. VJ, 
figs. 14—17; pl. V, figs. 8, 9. 
MM. Milne-Edwards and Jules Haime notice that P. Gravesana is “ trés voisine de la 
P. centralis; elle s’en distingue seulement par ses cdtes.”—‘ Hist. Nat. des Coral.,’ 
voli, p. 173. Pl. V, figs. 10—15. 
In the British Museum. 
2. ParnasMILIA MONILIS, Duncan. PI. V, figs. 4—7. 
The corallum is long, much curved, and distorted. It is more or less cylindrical 
above, and contracted here and there. Inferiorly it is pedunculate, the peduncle being 
small, curved, and long. 
The costa are nearly equal on the peduncle ; and there they are rather subcristiform, a 
secondary crest being found on each costa. In the intercostal spaces there is either a faint 
ridge, or a moniliform series of granules. On the body of the Coral the principal costz 
are sharp, wavy, granular, and keeled. They have several smaller and less prominent 
